Sierra Monitor Corporation 4501-04 User Manual

 

•  Wiring terminations clean and correct. 

•  Conduit seals and drains installed to avoid moisture build up in electronics enclosure. Water 

accumulation in sensor module enclosures is a major cause of damage and system failures - take 
precautions to seal electrical conduits and provide moisture traps and drains to avoid water damage 

•  Rain-shields installed where applicable. 

•  Loop voltage to be applied to the sensor module must be between 14 VDC and 30 VDC. 

The inspection and troubleshooting guide can be used to step through the system start-up and to determine 
the corrective action if a fault occurs. 

1. Repeat calibration procedure. 
2. Remove the gas and wait for the timer to completely count down. 
3. Apply Span Gas and verify that the sensor sees the correct value of the span gas after calibration. 
4. If the sensor still does not respond to gas, power cycle the unit and repeat calibration. 

 

1. Power cycle the module. 
2. Recalibrate the sensor. 

1. Power down the unit 
2. Open the enclosure and unplug the sensor from the transmitter board. 
3. Plug the sensor back into the transmitter board carefully and ensure a secure fit. 
4. Power up the unit. 

1.  Complete calibration or exit to operating mode. 

T ” – DOWNSCALE INDICATOR 

1.  The reaction of the sensor to gas may, for a short period of time, result in a downscale indicator being 

shown on the display.   

2.  If this indicator remains for a longer period of time, the sensor may need re-calibration. 

1.  The concentration of the gas is outside the calibrated range.